Adsorption and desorption of humic acid on aminated polyacrylonitrile fibers

Deng, Shubo; Bai, Renbi

doi:10.1016/j.jcis.2004.07.007

Cited by 78 publications

(44 citation statements)

References 24 publications

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“…The desorption efficiency rises to 90% after 5 min, showing that most desorption occurs in the initial few minutes. 12,41,42 Thus, FA-loaded CNTs can be quickly regenerated. High pH favors FA desorption but low pH solutions can reach the same efficiency as high pH over a longer time.…”

Section: Adsorption Of Fa From Synthetic Seawatermentioning

confidence: 99%

Adsorption of fulvic acids from aqueous solutions by carbon nanotubes

Wang¹,

Liu²,

Gong³

et al. 2007

J of Chemical Tech & Biotech

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Section: Adsorption Of Fa From Synthetic Seawatermentioning

confidence: 99%

Adsorption of fulvic acids from aqueous solutions by carbon nanotubes

Wang¹,

Liu²,

Gong³

et al. 2007

J of Chemical Tech & Biotech

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“…Numerous investigations have been conducted to evaluate HA removal using various adsorbents. Some of these adsorbents include irradiationcrosslinked carboxymethylchitosan [8], aminopropyl functionalized SBA-15 [9], bifunctional resin JN-10 [10], acidactivated Greek bentonite [11], basic ion exchange resin [12], chitosan-coated granules [13], Mg/Fe-layered double hydroxide [14], amine-modified polyacrylamide-bentonite composite [15], crosslinked chitosan-epichlorohydrin beads [16], Mg/Al-layered double hydroxides [17], fly ash [18], chitosan hydrogel beads [19], layer-structured graphite oxide [20], unburned carbons [21], surfactantmodified bentonite [22], activated carbon [23], aminated polyacrylonitrile fiber [24], and the composite of chitosan and activated clay [25].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of humic acid from aqueous solution on bilayer hexadecyltrimethyl ammonium bromide-modified zeolite

Zhan

Lin

Qiu

et al. 2011

Front. Environ. Sci. Eng. China

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Surfactant-modified natural zeolites (SMNZ) with different coverage types were prepared by loading hexadecyltrimethyl ammonium bromide (HTAB) onto the surface of a natural zeolite. The adsorption behavior of humic acid (HA) on SMNZ was investigated. Results indicate that the adsorbent SMNZ exhibited a higher affinity toward HA than the natural zeolite. HA removal efficiency by SMNZ increased with HTAB loading. Coexisting Ca 2+ in solution favored HA adsorption onto SMNZ. Adsorption capacity decreased with an increasing solution pH. For typical SMNZ with bilayer HTAB coverage, HA adsorption process is well described by a pseudo-second-order kinetic model. The experimental isotherm data fitted well with the Langmuir model. Calculated maximum HA adsorption capacities for SMNZ with bilayer HTAB coverage at pH 5.5 and 7.5 were 63 and 41 mg$g -1 , respectively. E2/E3 (absorbance at 250 nm to that at 365 nm) and E4/E6 (absorbance at 465 nm to that at 665 nm) ratios of the residual HA in solution were lower than that of the original HA solution. This indicates that the HA fractions with high polar functional groups, low molecular weight (MW), and aromaticity had a stronger tendency for adsorption onto SMNZ with bilayer HTAB coverage. Results show that HTABmodified natural zeolite is a promising adsorbent for removal of HA from aqueous solution.

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“…When comparing the spectrum of the MHA-D with those of the MHA, several major absorption peaks were shifted to lower wavenumbers. For example, a broad band of 3369 cm -1 of MHA was attributed to -OH and -NH 2 stretching vibrations (Deng and Bai 2004) was shifted to 3362 cm -1 in MHA-D, indicating the formation of H bonds (Baes and Bloom 1989;Wang et al 1999). The peak at 2930 cm -1 was due to aliphatic C-H stretching vibration (Kapoor and Viraraghavan 1997), while the shoulders presented at 1659 and 1628 cm -1 , were corresponded to the C=O stretching vibrations of quinone and H-bonded conjugated ketones .…”

Section: Sorption Mechanism Of the Dbsa On Hasmentioning

confidence: 99%

Sorption behavior of dodecylbenzene sulfonic acid on humic acids from Mollisol and Alluvial soils

Zhao

Song³

et al. 2016

Environ Earth Sci

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Dodecylbenzene sulfonic acid (DBSA), the acid form of sodium dodecylbenzenesulfonate (SDBS), is often identified and detected in soils. However, it still has less awareness of the sorption behavior of DBSA with soil organic matter. In this paper, the sorption behaviors of DBSA on two different types of soils (Mollisol and Alluvial soils) and soil humic acids (HAs) were studied and compared, and the mechanisms of HAs and DBSA interactions were discussed. Sorption dynamics and isotherms were studied using the batch equilibrium method. The sorption kinetics was relatively slow, and the sorption equilibrium can be reached within 10 h. In the designed concentration range of DBSA in this work, the maximum DBSA sorption capacities on the Alluvial soil HA (AHA) and the Mollisol soil HA (MHA) were 115.0 and 112.2 mg/ g, respectively, which were higher than those of the Alluvial soil (AS) and Mollisol soil (MS). The sorption isotherms were well fitted by the Freundlich equation. The sorption capacity of the AHA was greater than that of the MHA, AS and MS. Furthermore, the sorption complexes of HAs and DBSA were characterized using elemental analysis, micro-Fourier transform infrared spectroscopy (FTIR), solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy and electron spin resonance spectroscopy (ESR), it reveals that the sorption of DBSA on HAs mainly occurred on the C=O, C-O and aromatic functional groups. Moreover, the sorption data indicated that the sorption behavior was complicated, probably due to the formation of H bonds, hydrophobic interactions and electron donoracceptor mechanisms.

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Adsorption and desorption of humic acid on aminated polyacrylonitrile fibers

Cited by 78 publications

References 24 publications

Adsorption of fulvic acids from aqueous solutions by carbon nanotubes

Adsorption of fulvic acids from aqueous solutions by carbon nanotubes

Adsorption of humic acid from aqueous solution on bilayer hexadecyltrimethyl ammonium bromide-modified zeolite

Sorption behavior of dodecylbenzene sulfonic acid on humic acids from Mollisol and Alluvial soils

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